document.getElementById("demo").innerHTML = ages.findIndex(checkAdult);} 其结果将是: 2试一试» 更多“试一试”的例子。 定义和用法 该findIndex()方法返回在通过测试(作为一个功能提供)数组的第一个元素的索引。 该findIndex()方法为每个数组中存在的元素,一旦执行函数: ...
C# List FindIndexThe FindIndex method returns the zero-based index of the first element that matches the predicate. If no element is found, it returns -1. public int FindIndex(Predicate match); public int FindIndex(int startIndex, Predicate match); public int FindIndex(int startIndex, int...
element:当前元素。 index(可选):当前元素的索引。 array(可选):调用find的数组。 thisArg(可选):执行回调时用作this的对象。 示例代码 代码语言:txt 复制 const users = [ { id: 1, name: 'Alice' }, { id: 2, name: 'Bob' }, { id: 3, name: 'Charlie' } ]; // 查找id为2的用户 const...
We also have theindex()function in Python that returns the index of the given element if it is present in the list. If not, then it throws aValueError. To get the index of the maximum element in a list, we will first find the maximum element with themax()function and find its index...
To find the index of an element in an int array in Java, you can use the indexOf() method of the Arrays class. The indexOf() method returns the index of the first occurrence of the specified element in the array, or -1 if the element is not found. Here is an example of how ...
Example 1: Get Index of Last Occurrence of Element In this example, we will take a list of elements (say strings). We will then find the last index of element"bc"in the list using List.lastIndexOf() function. Kotlin Program </> ...
ThefindIndex()method returns the index (position) of the first element that passes a test. ThefindIndex()method returns -1 if no match is found. ThefindIndex()method does not execute the function for empty array elements. ThefindIndex()method does not change the original array. ...
array.findLast(function(currentValue, index, arr),thisValue) Parameters function()Required. A function to run for each array element. currentValueRequired. The value of the current element. indexOptional. The index of the current element. ...
value: current collection element index: current collection element index collection: the collection varfindIndex=require('array.prototype.findindex');findIndex.shim();// if you want to install it on the global environment Code example: // Default:[1,5,10,15].findIndex(function(a){returna>...
Modify the program to insert the element at the correct index in the array. Write a program to find the index of the first and last occurrence of a number. Modify the program to return the index using binary search. Write a program to find the closest index where an element could be in...